Which external hard drive should I get for my new 24 inch iMac? Western Digital MyBook Home Edition 500GB with USB 2.0 and FireWire 400 for $119. or.... Western Digital MyBook Essential Edition 1TB (terabyte) with only USB 2.0 connection for $129 (No FireWire 400). All I back up are my important documents, IPhoto Library (12,000 photos - currently 5.4 GB in size), ITunes Library (which is less than 200 songs), and some clip art images. Is the FireWire 400 connectivity more important than the extra 500GB in hard drive space and would I ever even use more than 500GB of space when on my computer I am only using 50GB of my hard drive right now. Lastly, did Western Digital make a change to their external hard drives in the past 1-2 years. I have an old one where the blue circle moves around when backing up and it was noisy. I noticed that the newer ones are a lot quieter now and they don't make much noise??